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jackofallgames0's avatar
jackofallgames0
6 years ago
Solved

Horrible Peformance on iMac 2019 with Vega 48 (Core i9)

Hello everyone!  So I just got a maxed out 2019 iMac with Core i9 and Vega 48 graphics. I know that Vega 48 isn't the ultimate graphics card, but it's definitely a card that can handle AAA games (I ...
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  • Bluebellflora's avatar
    Bluebellflora
    6 years ago

    @jackofallgamesYT 

    Thanks 🙂 Right click on the game in your Applications folder and select Show Package Contents then navigate to Contents > Resources, then open the GraphicsCards.sgr file with TextEdit. Directly under the first line showing vendor "ATI" 0x1002 create a new line and copy/paste the following:

    card 0x6869 "AMD Radeon Pro Vega 48" $cardLevelUber $resolutionHigh

    Then quit the file and launch your game. How is it? After you close it please open the config file again and see it is now says [Found: 1, Supported: 1]

jackofallgames0's avatar
jackofallgames0
5 years ago
@Bluebellflora @Bluebellflora Hello! Thought you might be interested to know that performance was *greatly* improved after I downgraded to Mojave.

The game worked better, but was still quite chuggy and stuttery while playing in Catalina, but I downgraded to Mojave for 32 bit apps and the game ran much smoother, almost a solid 60fps at 4k max settings, only slight dips when moving the camera around Sims or builds. But few stutters.
  • Bluebellflora's avatar
    Bluebellflora
    Hero+
    5 years ago
    @jackofallgamesYT

    Great that you could go back to Mojave! Wonder if the drivers for the Vega in Catalina are the issue? My 2019 iMac is still running Mojave but I'm running Catalina on my MBP with AMD Radeon Pro 560 4GB and it runs well.

    Thanks so much for the feedback, it's so helpful 🙂

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